Films cast film extrusion

LDPE is also versatile with respect to processing mode, and is adaptable to blown film, cast film, extrusion coating, injection molding, and blow molding. Film is the... 

Calendered PE sheet (Crinothene) was used for lampshades. Winothene was a low molecular weight PE made for wax applications. Halothene was a chlorinated PE. None of these proved a growth driver for the PE business. However, a major application for PE was found once ICl Plastics started its first 122 cm (48") film extruder. Today, extmded film (blown film, cast film, extrusion coating) is the major process/application across the main types of PE. 

Rheological studies on concentrated solutions provide information on intermolecular interactions in addition to data that can help to design processing conditions for fabrication techniques involving concentrated solutions, e.g., fiber spinning, film casting, film extrusion, etc. 

P. C. Wu, Metallocene ethylene based resins in cast film extrusion and application, MetCon 94 Proceedings, USA, May 1994. 

What process variables control the degree of orientation in a film manufactured via cast film extrusion and blown film extrusion ... 

Multilayer cast-film extrusion, VDC copolymers in, 25 725, 729-733 Multilayer ceramic capacitors (MLCC), platinum- group metals in,... 

The basic principle is somewhat similar to cast film extrusion but the flow of the polymer is obtained by dissolving it in a solvent instead of heating it during mechanical shearing in an extruder. 

Cast film extrusion of polyolefins has been developed to obtain flexible films with a high level of transparency by freezing the amorphous polymer structure of the melt on a chill roll. Cast films are mono-oriented in extrusion direction. 

Cast film extrusion. In a cast film extrusion process, a thin film is extruded through a slit onto a chilled, highly polished, turning roll where it is quenched from one side. The speed of the roller controls the draw ratio and final film thickness. The film is then sent to a second roller for cooling of the other side. Finally, the film passes through a system of rollers and is wound onto a roll. A typical film casting process is depicted in Figs. 3.53... 

Figure 8-6. Schematic of cast film extrusion process (reprinted with permission from Tess and Poehlein, copyright 1985, American Chemical Society).

The cast film extrusion process is schematically shown in Figure... 

Dowlex. [Dow] PE (vLLDPE resin resin for blown and cast film extrusion, inj. molding. 

Cast-film extrusion LLDPE, HDPE Eilm is extmded through a slit-die then passed through chilled rollers to crystallize and smooth the surface orientation by cold drawing... 

In cast film extrusion, the molten PLA Is extruded through a lip die and quenched on highly polished chrome rollers that are... 

Cast Film Extrusion, Extrusion Coating and Lamination... 

Fundamentals of cast film extrusion technology. Macro White Papers, http //www.macroeng. com/fundamentals-of-cast-film-extrusion-technology.php... 

Uses Adhesive/sealant resin for use in blown and cast film extrusion applies, incl. meat/poultry/seafood/cheese pkg., cereal liners, medical/ pharmaceutical pkg., powd./granularfood and non-food pouches, carded display/skin packaging films edible oil, motor oil, other li prod, pouches, snack structures coextrusions with nylon or in other film structures as heat seal or tie layer Features High clarity grade Regulatory FDA 21 CFR 177.1330 compliant Properties Melt flow 1.5 dg/min f.p. 78 C m.p. 103 C Vicat soften, pt. 81 C ultimate tens. str. 33.1 MPa (MD) ultimate elong. 450% (MD) Spencer impact str. 29 J/mm Dart drop str. 7.9 g/pm Elmendorf tear str. 46.3 mN/pm 9% methacrylic acid... 

Uses Extmsion coating resin for high density cast films, extrusion coatings... 

Filmex Cast film extrusion Windmoeller/ Hoelscher... 

In cast film extrusion, the molten PLA is extruded through a dye and successively rolled. The production of PLA films or sheets by this processing method is veiy similar, with the only difference being the thickness of the resulting material. Typically films are in the order of less than 70 pm whereas sheets have thicknesses higher than 0.25 mm. % using the same technique, PLA is often co-extruded along with other polymers to form... 

Cast film extrusion See chill roll extrusion. 

Another process for producing plastic films is flat, or cast, film extrusion. In this process the extruder pumps molten resin through a flat film or sheet die. The melt leaves the die in the form of a wide film, or sheet. This is typically fed into a chill-roll assembly which stretches and cools the film. After the film passes through the rolls, the film is wound up on a roll. 

Both blown and cast film extrusion operations use special resin formulations, which include a number of additives to impart various characteristics to the film. Among the most important additives are materials to control slip and dcCTcase blocking tendencies. Slip is defined as the tendency of the film to slide on itself and is related to the material s coefficient of friction. Blocking is the tendency of a tightly wound roll of film to stick to itself and form a solid block of plastic that cannot be easily nnwound. 

Non-contact IR thermometers are used in a large number of extrusion operations blown film, cast film, biaxially oriented film, sheet, extrusion coating, etc. In some IR thermometers, an entire surface can be scanned and isotherms can be determined. With additional instrumentation, quantitative information on the temperature distribution can be obtained [5]. Portable infrared thermometers can be used to spot check the process, maintain equipment, and do general plant maintenance they are also very useful tools in troubleshooting. 

The common methods of processing LDPE are blown and cast film extrusion and coextrusion, extrusion coating, blow molding, injection molding, rotomolding, and wire extrusion. Explanations for these processes can he found in other articles in the Encyclopedia. 

---